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Mirrors > Home > MPE Home > Th. List > lt2halvesd | Structured version Visualization version GIF version |
Description: A sum is less than the whole if each term is less than half. (Contributed by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
rehalfcld.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
lt2halvesd.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
lt2halvesd.3 | ⊢ (𝜑 → 𝐶 ∈ ℝ) |
lt2halvesd.4 | ⊢ (𝜑 → 𝐴 < (𝐶 / 2)) |
lt2halvesd.5 | ⊢ (𝜑 → 𝐵 < (𝐶 / 2)) |
Ref | Expression |
---|---|
lt2halvesd | ⊢ (𝜑 → (𝐴 + 𝐵) < 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lt2halvesd.4 | . 2 ⊢ (𝜑 → 𝐴 < (𝐶 / 2)) | |
2 | lt2halvesd.5 | . 2 ⊢ (𝜑 → 𝐵 < (𝐶 / 2)) | |
3 | rehalfcld.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
4 | lt2halvesd.2 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
5 | lt2halvesd.3 | . . 3 ⊢ (𝜑 → 𝐶 ∈ ℝ) | |
6 | lt2halves 11480 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → ((𝐴 < (𝐶 / 2) ∧ 𝐵 < (𝐶 / 2)) → (𝐴 + 𝐵) < 𝐶)) | |
7 | 3, 4, 5, 6 | syl3anc 1477 | . 2 ⊢ (𝜑 → ((𝐴 < (𝐶 / 2) ∧ 𝐵 < (𝐶 / 2)) → (𝐴 + 𝐵) < 𝐶)) |
8 | 1, 2, 7 | mp2and 717 | 1 ⊢ (𝜑 → (𝐴 + 𝐵) < 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 ∈ wcel 2140 class class class wbr 4805 (class class class)co 6815 ℝcr 10148 + caddc 10152 < clt 10287 / cdiv 10897 2c2 11283 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1871 ax-4 1886 ax-5 1989 ax-6 2055 ax-7 2091 ax-8 2142 ax-9 2149 ax-10 2169 ax-11 2184 ax-12 2197 ax-13 2392 ax-ext 2741 ax-sep 4934 ax-nul 4942 ax-pow 4993 ax-pr 5056 ax-un 7116 ax-resscn 10206 ax-1cn 10207 ax-icn 10208 ax-addcl 10209 ax-addrcl 10210 ax-mulcl 10211 ax-mulrcl 10212 ax-mulcom 10213 ax-addass 10214 ax-mulass 10215 ax-distr 10216 ax-i2m1 10217 ax-1ne0 10218 ax-1rid 10219 ax-rnegex 10220 ax-rrecex 10221 ax-cnre 10222 ax-pre-lttri 10223 ax-pre-lttrn 10224 ax-pre-ltadd 10225 ax-pre-mulgt0 10226 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1073 df-3an 1074 df-tru 1635 df-ex 1854 df-nf 1859 df-sb 2048 df-eu 2612 df-mo 2613 df-clab 2748 df-cleq 2754 df-clel 2757 df-nfc 2892 df-ne 2934 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rmo 3059 df-rab 3060 df-v 3343 df-sbc 3578 df-csb 3676 df-dif 3719 df-un 3721 df-in 3723 df-ss 3730 df-nul 4060 df-if 4232 df-pw 4305 df-sn 4323 df-pr 4325 df-op 4329 df-uni 4590 df-br 4806 df-opab 4866 df-mpt 4883 df-id 5175 df-po 5188 df-so 5189 df-xp 5273 df-rel 5274 df-cnv 5275 df-co 5276 df-dm 5277 df-rn 5278 df-res 5279 df-ima 5280 df-iota 6013 df-fun 6052 df-fn 6053 df-f 6054 df-f1 6055 df-fo 6056 df-f1o 6057 df-fv 6058 df-riota 6776 df-ov 6818 df-oprab 6819 df-mpt2 6820 df-er 7914 df-en 8125 df-dom 8126 df-sdom 8127 df-pnf 10289 df-mnf 10290 df-xr 10291 df-ltxr 10292 df-le 10293 df-sub 10481 df-neg 10482 df-div 10898 df-2 11292 |
This theorem is referenced by: abs3lem 14298 metustexhalf 22583 nlmvscnlem2 22711 metdcnlem 22861 cntotbnd 33927 addlimc 40402 fourierdlem103 40948 fourierdlem104 40949 |
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